IRS13 Search Matching Functions chapter E. M. Keen Harvard University Gerard Salton Use, reproduction, or publication, in whole or in part, is permitted for any purpose of the United States Government. Cosine1 Numeric, Stem O[OCRerr]O Overlap, Numeric 3 Stem Overlop1 Logicol1 Stem X[OCRerr]X Cosine, Logical, Stem Precision 1.0 0.8 0.6 0.4 0.2 mOX¾ [OCRerr][OCRerr][OCRerr][OCRerr]Recoll I I I 0.8 1.0 0 0.2 0.4 0.6 IRE-3, 314 Requests O[OCRerr]O Cosine, Numeric, Stem O[OCRerr]O Overlap, Numeric, Stem Overlap, Logical, Stem [OCRerr]x Cosine, Logical, Stem x Precision 1.0 0e8 0.6 0.4 0.2 0 0.2 0.4 0.6 0.8 CRANFIELD-l, 142 Requests I I I I I [OCRerr] Rec( 1.0 Perforuance curves comparing the four matching functions on two collections. Fig. 33